Mörka Hålkärret Nature Reserve on Omberg has a lot to offer for lovers of wetland - a lime-rich marsh, a swamp forest and a pond!

In the marsh there is a profusion of lime-loving species. Among the many orchids there are large numbers of Fly and Common Spotted Orchid. Ruddy Scirpus, Birds-eye Primrose, Butterwort, Bogbean and Tormentil are also common. Once the very rare Single-leaved Bog Orchid occurred here.

The area around the marsh is dominated by a swampy forest of Alder and Spruce. Some of the spruces are very large and there are alders with very fine boles. A stream that flows to the west runs through the swamp forest. The flora is very rich and includes species such as Twayblade, Dog's Mercury and Lily of the Valley.

The pond, which is 1.5 metres deep, was created in 1919 by the School of Forestry on Omberg by damming up two streams that ran into the marsh. Originally it was used to farm trout but now there are only Crucian Carp and possible Tench. The Common and Great Crested Newt thrive in the pond, together with Grass Snake, Common Toad and a variety of aquatic insects.

The reserve comprises nearly 11 hectares and is owned by Svea Skog.